#include <iostream>
#include <pthread.h>
#include <string>
#include <cstdio>
#include <unistd.h>

pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;

//使用全局变量初始化
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;

void *active(void *args)
{

    std::string name = static_cast<const char *>(args);

    while (true)
    {
        pthread_mutex_lock(&mutex);
        // 判断资源是否准备就绪
        pthread_cond_wait(&cond, &mutex); // 等待资源准备就绪
        printf("%s is active\n", name.c_str());
        pthread_mutex_unlock(&mutex);
    }

    return nullptr;
}

int main()
{
    pthread_t tid1, tid2, tid3;
    pthread_create(&tid1, nullptr, active, (void *)"thread-1");
    pthread_create(&tid2, nullptr, active, (void *)"thread-2");
    pthread_create(&tid3, nullptr, active, (void *)"thread-3");

    sleep(1);
    printf("Main thread ctrl begin...\n");

    while (true)
    {
        printf("main wakeup thread...\n");
        pthread_cond_signal(&cond);
        //pthread_cond_broadcast(&cond);
        sleep(1);
    }

    pthread_join(tid1, nullptr);
    pthread_join(tid2, nullptr);
    pthread_join(tid3, nullptr);

    return 0;
}